The sun is the field-magnet, and the earth is the revolving armature of nature's great dynamo-electric machine.
In practice, the frame B A C is made to carry the field-magnet of an electric motor for spinning the wheel.
N and S are cast-iron prolongations of the same, and are usually bolted to the field-magnet.
In this case H would represent the armature and E the field-magnet.
The coils E are included in the circuit of a generator F, by means of which the field-magnet is energized.
The magnet, called the field-magnet, is merely to furnish lines of magnetic force.
The other branch goes through additional coils which are wound on the field-magnet, and also through the external circuit.
The armature is made to revolve rapidly between the poles of the field-magnet by means of a handle that works up and down.
The field-magnet in this case consists of two annular parts H H, provided with annular grooves I for the reception of the coils.
In Fig. 75 let A designate the field-magnet of a motor which, as in all these motors, is built up of sections or plates.
|field magnet |
A permanent magnet used to produce a base magnetic field against which other magnetized materials react, as in the operation of electrical devices such as motors, generators, and solenoids.